Adaptation from Leaps in the Dark
Although many adaptations occur by selection of beneficial alleles transformed from neutral or deleterious standing variation, new identical mutant alleles that arise as premeiotic clusters have an increased probability of fixation that can rise to the levels that are similar to the fixation of standing variation. Hence, the evidence is still out on the proportion of adaptations that use preexisting variation and new mutations.
Availability via databases maintained by the United States National Library of Medicine.
Woodruff, Ronny C. and Zhang, M, "Adaptation from Leaps in the Dark" (2009). Biological Sciences Faculty Publications. 31.
The Journal of Heredity